Shimano Introduces Electronic Dura-Ace Components With DI2 Technology

A first look at the 2009 edition of Shimano Dura-Ace.

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Shimano argues that the shifting system is not wireless because that would need additional power which again would lead to the need for a heavier battery. It would also be less reliable than the technology that Shimano has opted for, says Shimano representatives. Or is it just that it hasn't been fully invented and developed yet?

Time Trial Dura-Ace with Di2 technology contributes to time trial riding by its multi position shifters. It allows riders to shift while braking and enjoy an effortless operation even when riding in the aerodynamic position.

Complimenting the regular package, a dual control lever ST-7971 with electronic shift buttons for time trial and triathlon usage is introduced. The carbon brake lever has been developed with a reach adjustment mechanism to fit all hand sizes. This dual control lever is compatible with the new FlightDeck computer SC-7900.

Finally, an electronic satellite switch SW-7971 will be available that can be integrated into time trial handlebar extensions. The shift wires can be guided through the bars for optimal aerodynamics.

The new DI2 electronic version of the Shimano Dura-Ace component series will be available in stores worldwide stating January 2009.